Hello R Users,
I am using R on Windows,
 I am ploting CO2 (350,380) variying with year(1993,2003)
I want to over-plot rainfall (10,250) varying with year(1993,2003) on axis-4

 axis-1=year(1993,2003),
axis-2=CO2(350,380)
axis-3=None
axis-4=rainfall(10,250)
Kindly help how to over-plot another variable on axis-4.

Many thanks,

Regards,
Yogesh

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